Research On Evaluation Of Anti-attack Description Model Of Vector Geographic Data

Geographic information is an important strategic resource in the basic national conditions,it directly related to the national security and interests of our country.Vector data is a kind of geographic information which is widely used,and it requires a lot of manpower,material and financial resources to be produced and maintained.Currently,there are obvious deficiency in the research of the security of vector data,and the problem how to protect the vector geo-data without affecting the sharing of data at the same time need to be solved.This thesis focus on the requirement of declassification for vector geo-data,conducted the following research supported by geometric precision declassification technology:Firstly,this thesis studied on the declassification model and declassification Characteristics of vector geo-data,analyzed the characteristics of vector geo-data and the requirement of declassification.The geometrical precision declassification experiments of the geo-data based on the control points were carried out which using the single and mixed decryption model.The declassification characteristics of each model were analyzed from the aspects of theory,error distribution and topology preservation.Secondly,the attack method and attack model of declassification data were researched.A clear attack method which declassification model and key are known and a blind attack method which both declassification model and key are not known were proposed for declassification data,and the implementation steps of the two methods were introduced.Then,the attack model was selected from the analysis of the theory,the characteristics of the declassification data and the recovery data.Thirdly,research on evaluation of anti-attack decryption model.The evaluation system for data after the clear attacking and blind attacking,which set geometric accuracy,logical consistency and completeness as the main level evaluation index was built.The evaluation method of the effect of recovery data was designed combined with the evaluation index.Fourthly,a prototype system of anti-aggressive evaluation for vector data declassification model which set attack Algorithm as the Core was designed and developed based on the theoretical research of this thesis.It realized the functions of declassifying of vector geo-data,attacking of vector geo-data and evaluating of the effect of recovery data.